Stabilization of Organic Phosphorus

Pant, H.K. and Reddy, K.R. (2001) Flydrologic influence on stability of organic phosphorus in wetland detritus. Journal of Environmental Quality... 

This chapter reviews the abiotic processes that can lead to the stabilization of organic phosphorus in soils and the aquatic environment. In particular, we examine the role of adsorption to soil minerals, complex-ation reactions, precipitation with polyvalent cations and the incorporation of organic phosphorus into humic substances in stabilizing organic phosphorus. We then discuss the effects of soil solution chemistry on these reactions, as well as the effects of these reactions on the environment. 

In the field of organic phosphorus compounds there is a wealth of highly toxic compounds from which to pick a potential insecticide. The ultimate choice will be based not only on toxicity to a certain group of insect species, but on volatility, stability, safety in handling and applying, and freedom from plant injury, spray-residue and translocation hazards, and long-term toxicity to man and animals. 

The productivity of many ecosystems is determined by the chemical stability of phosphate, its relative immobility in soil, and its low concentration in the soil solution (approximately 1 xM). Phosphorus uptake by plant roots occurs mainly as phosphate ions (H2P0 and HPO ) from the soil solution, which depends on the solubilization of mineral phosphates and the degradation or mineralization of organic phosphorus. During phosphate uptake, a phosphorus-depleted area is formed close to the root, since phosphate uptake is faster than its diffusion in soil (Bhat and Nye, 1973). Having... 

Brannon, C.A. and Sommers, L.E. (1 985) Stability and mineralization of organic phosphorus incorporated into model humic polymers. Soil Biology and Biochemistry 17, 221-227. 

The phosphonite type is much less effective than the phosphite type in the stabilization of poly(aryl ether ketonejs. However, the addition of organic phosphorus compounds in conjunction with an organic acid, such as oxalic acid or acetic acid results in a very significant reduction in melt viscosity, even where the phosphorus compound alone has a detrimental effect. The results using the stabilizers can be summarized as follows ... 

Source. Esters of organic phosphorus compounds are used as fire retardanb solvents stabilizers antioxidants in lubricants, rubber, or plastics gasoline additives plasticizers and pressure additives in lubricants. 

Trifluoromethanesulfonic (triflic) anhydride is commercially available or can be prepared easily by the reaction of triflic acid with phosphorus pentoxide [66] This moderately hygroscopic colorless liquid is a useful reagent for the preparation of various organic derivatives of triflic acid A large variety of organic ionic triflates can be prepared from triflic anhydride A recent example is the preparation of unusual oxo-bridged dicatiomc salts of different types [SS, 89, 90, 91, 92, 93] (equations 38-44) Stabilized dication ether salts of the Huckel aromatic system and some other systems (equations 38 and 39) can be prepared in one step by the... 

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